ISO 9698:2010 水质 氚活性浓度的测定 液体闪烁计数法
标准编号：ISO 9698:2010
中文名称：水质 氚活性浓度的测定 液体闪烁计数法
英文名称：Water quality — Determination of tritium activity concentration — Liquid scintillation counting method
发布日期：2010-12
标准范围
ISO 9698:2010规定了使用液体闪烁计数法测定环境水或氚化水样品中氚活度浓度的条件。分析程序的选择，在测定前是否蒸馏水样，取决于测量目的和样品特性。使用液体闪烁计数直接测量原水样品必须考虑其他β发射体放射性核素的潜在存在。为了避免在检测这些放射性核素时干扰它们，氚的定量将在样品蒸馏处理后进行。描述了三种蒸馏程序。该方法不适用于有机结合氚的分析；其测定需要额外的化学处理（如化学氧化或燃烧）。在合适的技术条件下，检测限可低至1 Bq·l-1。可以在没有任何样品稀释的情况下测定低于106 Bq·l-1的氚活度浓度。先前的富集步骤可以显著降低检测限。
ISO 9698:2010 specifies the conditions for the determination of tritium activity concentration in samples of environmental water or of tritiated water using liquid scintillation counting.The choice of the analytical procedure, either with or without distillation of the water sample prior to determination, depends on the aim of the measurement and the sample characteristics.Direct measurement of a raw water sample using liquid scintillation counting has to consider the potential presence of other beta emitter radionuclides. To avoid interference with these radionuclides when they are detected, the quantification of tritium will be performed following the sample treatment by distillation. Three distillation procedures are described.The method is not applicable to the analysis of organically bound tritium; its determination requires additional chemical processing (such as chemical oxidation or combustion).With suitable technical conditions, the detection limit may be as low as 1 Bq l-1. Tritium activity concentrations below 106 Bq l-1 can be determined without any sample dilution. A prior enrichment step can significantly lower the limit of detection.
标准预览图
